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sicians, teachers, and others interested have inves- tigated and confirmed these facts. 6. It should be emphasized that there is but one cause of myo- pia, an effort to see distant objects. There is no other cause. Near use of the eyes is not a cause of myopia. By the aid of simultaneous retinoscopy, it was al- ways demonstrated that an effort to see near ob- jects lessened myopic refraction or produced hy- permetropic refraction. Prevention of diseases is usually suggested by the cause. When the cause is known, Vigora 5000 prevention may be successful, but when the cause is not known pre- vention is uncertain. For example: Yellow fever, twenty five years ago, was not prevented by quar- antine, disinfection, or other methods until the cause was discovered, the infected mosquito. By removing the cause, yellow fever has been elimi- nated from Havana and Vigora Oil Panama. Likewise, previous efforts to prevent myopia have failed because the cause was not known. It Vigora Price Vigora 100 Tablets was erroneously believed that when school chil- dren regarded, or made an effort to see, distant objects, that the eyes were at rest or that accom- modation or myopic refraction Vigora Tablets did not occur. Sim- ultaneous retinoscopy disproved this assumption. It has been repeatedly demonstrated with the aid of the retinoscope that all school children with nor- mal eyes when regarding unfamiliar writing or fig- ures on the blackboard, distant maps, diagrams, or pictures had myopic refraction. It was quite other- wise when they regarded a familiar distant object. The retinoscope used at the same time Cheap Vigora indicated no myopic refraction. The Snellen test card, while being of use for test- ing the acuity of vision, was found also during the past ten years to be the best distant object for ex- ercises in distant vision. It should be memorized and thus made a familiar distant object. After its daily use for half a minute or longer myopia was prevented : and, in addition the vision of many pu- pils with defective sight was improved for an un- familiar Snellen card, for writing and figures on the blackboard, and for other distant objects. Fur- thermore, near vision was benefited by the use of the Snellen card. Many pupils stated that they could study their lessons with less or no discom- fort. Myopia prevention was introduced in Public Schools Nos. 6, 183, and 186 of New York city. January. 1912: later. Public Schools Nos. 46 and 43 tested the method. The Method. .\ Order Vigora Snellen test card was placed iJermanently where all the pupils could see it from their seats. Daily the teachers recommended all the children to silently read the card with each eye separately, cov- ering the other eye with the palm of the hand in such a way as to avoid pressure on the eyeball. Records were made with the same card or with Aupisi 30, 19' J- J HATES: PRIUIIS'TION OF MYOPIA. 411 an unfamiliar card for testing the vision. This matter is discussed below. I^ach line of the Snellen c;ir(l is desijjnated by a number which indic;itcs thi- feet that the line should l)e read by the normal eye. Records of the vision are written in the form of a fraction : The numerator of the fraction repre- sents the distance in feet of the pupil from the card Vigora Online while the denominator denotes Vigora 100 the number which designates the lowest line Generic Vigora read. Records were usually submitted as follows: Public School Xo. 46. W. .\. Uovlan, principal. E. 6A., J. Hiesel. T., 27 D., 27 I., 27 N.. 25 \V., o l-'ebruary, 1913. April, 1913. luiie. 1913. R. L. R. L. k. L. John D 20/100 20/50 20/50 20/40 20/20 20/20 San ford G 20/50 27/70 20/30 20/40 20/15 20/20 Public School Xo. 6. The first school authorized to try the method was Public School Xo. 6. Miss K. D. Blake, principal. In November, iqii. she permitted me to test and record the vision of 115 pupils. Later, Buy Vigora she in- formed me that a medical inspector examined the same children and found my record correct. In one class room she observed me relieve the defective vision of five pupils in fifteen minutes with the aid of the Snellen card. She was told that the teachers were able to improve the vision of all pupils in the same simple way and thus, log- ically, prevent myopia. The memorized Snellen test card aroused much scepticism. Its value for testing the vision was questioned by Buy Vigora Online most teachers. To settle the matter, ^liss Blake had the vision of i.^ixi ])upils tested. January. 1912. Vigora 50 with a memorized Snellen card by the teachers. Soon afterward, the vision of the

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